What is a purchase order?

A purchase order, or PO, is a document a buyer sends to a supplier to confirm an order: what items, how many, at what price, and where to deliver. It is the buyer's formal commitment to buy on agreed terms. Once the supplier accepts it, the PO becomes a record both sides can rely on, so there is no dispute later about quantity or rate. The supplier then delivers against the PO and raises an invoice that matches it.

What must a purchase order include?

A PO should include a unique PO number and date, the buyer and supplier details, a clear list of items with quantity, rate and total, applicable taxes, the delivery address and expected date, and payment terms. It usually also carries a reference to any quotation it is based on. The single most important field is the PO number, because every later document, the delivery note and the invoice, ties back to it so the whole order can be tracked.

What is the difference between a purchase order and an invoice?

A purchase order is raised by the buyer before the goods move, to request and commit to an order. An invoice is raised by the seller after the goods or services are supplied, to demand payment. In short, the PO starts the transaction and the invoice closes it. A good process matches the two: the invoice quotes the PO number, so the buyer can confirm they are paying for exactly what they ordered at the price they agreed.

Do I need a purchase order for every purchase?

Not for every small buy, but a PO is worth raising for anything where quantity, price or delivery could be disputed later, or where an approval is needed before spending. For regular suppliers and larger orders, a PO protects both sides and speeds up matching the invoice at payment time. Many businesses set a value threshold above which a PO is required, and handle small everyday purchases with a simpler record.

Can I make a purchase order in Excel?

Yes, a simple PO can be built in Excel or any spreadsheet, and many businesses start there. The limitation is that a spreadsheet PO does not connect to your stock or your incoming invoices, so you match everything by hand. An app that raises POs, receives them against stock, and links the supplier invoice back to the PO number removes that manual matching and keeps the numbering clean without extra effort.

Purchase Order Format: What a PO Must Include, With a Sample (2026)

Before goods change hands, a good buyer puts the order in writing. That written order is the purchase order, or PO. It records exactly what is being bought, how many, at what price and where it should go, so neither side has to rely on memory or a phone call when the delivery arrives. A clear PO format prevents the two most common buying disputes, wrong quantity and wrong rate, and it makes matching the supplier's invoice at payment time quick. This guide explains what a PO is, the fields it must carry, a sample layout you can copy, and how it fits the buying flow from quote to payment.

What a purchase order is

A purchase order is a document the buyer sends to a supplier to confirm an order on agreed terms. It is the buyer saying, in writing, I am committing to buy these items, in these quantities, at these prices, delivered here by this date. Once the supplier accepts it, the PO becomes a shared record both sides can point to. The supplier delivers against it and raises an invoice that should match it line for line. Because the PO comes first, it sets the terms of the whole transaction, and everything that follows refers back to it.

The fields a PO must include

A purchase order does not need to be long, but it must be complete. Leaving out a field is what causes arguments later. Include all of these:

PO number and date: a unique running number and the date raised. This is the anchor every later document refers to.
Buyer details: your business name, address, GSTIN where registered, and a contact person.
Supplier details: the supplier's name, address and GSTIN.
Item lines: each item with a description, quantity, unit, rate and line total.
Taxes: applicable GST on the order so the expected total is clear.
Delivery address and date: where the goods should go and when they are expected.
Payment terms: when and how you will pay, such as within 30 days of delivery.
Authorisation: who approved the order, so the supplier knows it is genuine.

The PO number deserves special attention. It is the thread that ties the order, the delivery and the invoice together, so keep the numbering clean and never reuse a number.

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A sample purchase order format

Here is a sample PO layout for a shop ordering stock from a supplier. You can reproduce this in a spreadsheet or let a billing app fill it for you:

When the supplier ships against this PO, the delivery note and the final invoice should both quote PO-2026-052, so the buyer can confirm at a glance that they are receiving and paying for exactly what they ordered.

How the PO fits the buying flow

The purchase order is one link in a short chain that runs from asking a price to paying the bill. Understanding where it sits stops documents from getting mixed up:

Quotation: the supplier quotes a price for what you want to buy.
Purchase order: you accept by raising a PO that locks the items, quantity and rate.
Delivery: the supplier ships the goods with a delivery challan quoting the PO number.
Invoice: the supplier raises an invoice, also quoting the PO, to ask for payment.
Payment: you match the invoice to the PO and the delivery, then pay.

This is called three-way matching: the PO, the delivery and the invoice should all agree. When they do, you pay with confidence. When they do not, the mismatch is your early warning that something is wrong before the money leaves your account.

Purchase order versus invoice

The two documents are easy to confuse because they list the same items, but they point in opposite directions and are raised by different sides:

Keeping the two straight is what makes payment quick. If your supplier's invoice quotes your PO number, you are not hunting through records to check what you agreed. For more on the document that closes the sale, see our guide to the invoice maker app.

Why a PO protects both sides

It is tempting to skip the paperwork for a trusted supplier, but the PO protects the supplier as much as the buyer. For the buyer, it fixes the price and quantity so the invoice cannot creep upward. For the supplier, it is proof that the order was genuine and approved, so there is no risk of delivering goods the buyer later denies ordering. When a dispute does arise, the PO settles it in seconds because the agreed terms are written down and numbered. That protection costs nothing once your process raises a PO as a normal step, and it saves hours of argument on the one order in fifty that goes wrong.

Making POs without the manual work

A spreadsheet PO works, but it sits on its own and connects to nothing. You match it to the delivery and the invoice by hand, and the numbering drifts the moment two people raise POs at once. An app that handles buying keeps the whole chain joined: it raises the PO with the next clean number, receives the goods against it so your stock rises with the right cost, and links the supplier's invoice back to the PO for matching. That removes the part of purchasing that eats time, the reconciliation, and it means your stock and your payables stay accurate without anyone retyping figures. For how received goods flow into stock, see the bill book app guide.

The bottom line

A purchase order puts your buying in writing before the goods move, fixing the items, quantity, rate and delivery so the invoice that follows can be matched and paid with confidence. Keep the fields complete, guard the PO number, and let every later document quote it. IndiaCRM raises purchase orders, receives them into stock, and links the supplier invoice back to the PO in one free app. See GST billing software, browse the features, or get the mobile app and raise your first PO today.